Turning-machine



G. T. JOHNSON.

TURNING MACHINE.

APPLICATLONJILED MAY9, 1919.

Patented Mar. 23, 1920.

4 SHEETS -SHEET 1- G. T. JOHNSON.

TURNING MACHINE.

APPLICATION FILED MAY 9, 1919.

Patented Mar. 23, 1920.

4 SHEETS-SHEET 2- G. T. JOHNSON.

TURNING MACHINE.-

APPLICATION man MAY9,1919.

Patented Mar. 23, 1920.

4 SHEETS-SHEET a G. T. JOHNSON.

TURNING MAHINE.

APPLICATION man MAY 9. 1919.

4 SHEETS-SHEiET 4.

Patented Mar. 23, 1920.

them is a single trussed or braced link 220 onfr pins or shafts 23 mounted;

in the apertures of sections 20, and pro-ihung at its top by appropriate ears alined threaded vided with nuts 230. The lower part of this link which is of substantial size, at its two ends is pivoted at 24, 24; to the lower inner portion of an upright support or table 25 having a plane or flat top surface.

Each of the hoods 21 internally receives the upper end of one of a pairof outer or front links-26 hinged thereto on a shaft or pin 27 fitted in bearings of and extended through the side-walls of the hood and pro jecting down through a registering opening in the top wall of the frame, these two front links at their lower ends being pivoted or hinged at 28 to the front base portion of the support or table 25. It should be noted that the pair of outer or front links 26 are somewhat longer than the single back or inner braced link and the center of shaft 27 is at a slightly higher level than the centers of the supporting pins or shafts this COHstli'lCtlOll being used to give the table a substantially vertical position when it is swung intovthe field of action of the revolving cutter blades, that is, close to the rear portion of the main frame. Aswill be readily understood this parallel-motion link mounting for the table gives the upper end of the latter and the work which it carries a substantially-horizontal plane movement toward and from the blades at least throughout their field of action. j

This table 25 has a flat plate SO hinged to its top; face bya bolt 3L and a locking bolt taking through a slot 33 in the plate and threaded into the table, the construction perniitting'angular adjustment of this plate and the work and its supports .withrespect to the axis-10f the cutters or knives.

At one'end such adjustable plate carries a head-stock comprising a bearing 41, a shaft 42 therein, and-a work engaging and driving center piece 42, the shaft and work beingrotated by a sprocket. wheel lron the former driven by a.sprocket orsilent chain 44 from a suitable source of power not fisr \t. its other end the table or plate is provided with a. tail-stock consistingof a bearing 50, a center shaft reciprocable therein and equipped with rack teeth on its top which are in mesh with those of a pinion 57 on a cross shaft 5.4 to which a weightedarm is attached, whereby the weight of the arm. holds the center piece up to the work, turningor lifting ofthe weighted arni re tracti'ng the center and freeing. the work characterized 56 and shown in dotted lines.

To. provide. foradjustinent of the tailstocl'r toward and. fromthe head-stock for the accommodation of pieces of 7 work of different lengths, the top surface of plate 30 is supplied with a pair of parallel longitudinal undercut grooves (50, 60 which re- ,ceive the heads of the tail-stoek holding bolts 61. Obviously, by loosening these bolts the tail-stock may be moved lengthwise the plate and then held firmly in the new ad justed position by tightening the nuts of the bolts.

5 In order to shift the work-carrying table toward and from the revolving blades to effect the cutting or turning operation, and to permit the removal and insertion of the pieces of work or stock, the .main frame of the machine is supplied at its front with a pair of alined bearings 70, for a shaft 71 provided at its right-hand end with a curved operating handle 72. Fixed to such shaft just inside of its bearings are two arms 73, 73 connected to the table or work support by substantially-horizontal links 74', 74-. 0b viously, the rocking or oscillation of shaft 71, by its handle or lever. effects a similar movement in the table and the parts which it carries by reason of such link connections.

The operation of the appliance occurs practically as follows. The cutters 16 revolving in the usual manner, a piece of work is introduced between the centers of the head and tail stocks on the table in the usual manner by manipulation of the weighted arm 55 which retracts the tail-stock center. This introduction of the work is accomplished while the table is forwardly away from the cutters. Thereupon the handle 72 is pushed rearwardly carrying the table and work in the same direction thereby conveying the rotating work or stock into the field of action of the cutters which turn it in the well known way. Upon completion of-the turning operation the handle and table are retracted and the turned product removed. It is to be especially noted that the Work travels toward the cutters in a straiglit line the link motion for the table being such that the work throughout the range of action of the knives moves in a horizontal plane as is required with some kinds of turning work and desirablein others. It will be aprn'ec-iated that by reason ofsupporting the table by links in the man'- ner shown and described their bearings may be kept clean and free from dirt and the parts maintained in proper ad]ustment. Furthermore, owing to the difference in length between the links, the table is maintained in a substantially upright position during the turning operation, that is, the table. is. upright when near the back portion of the frame and is inclined somewhat as the work is rarried away from the cut ters.

Many minor mechanical changes may be made in the structure shown and described withoutv departure from the substance and essence of the invention and without the sacrifice of any of its substantial benefits and advantages, and it is to be understood that all. such changes falling within the scope of the appendedclaims will use the principles of the invention.

I claim:

1. In a turning appliance of the character described, the combination. of a frame, one or more knives thereon, a support for the wor; movable toward and from said one or more knives, and a link mounting for said Work support constructed to cause the WOI'I to travel. in a plane throughout the range of action of the knife or knives thereon, substantially as described.

2. In a turnil'lg appliance of the charactcr described, the combination of a frame, a revoluble shaft thereon, one or more knives on said shaft, means to rotate said shaft, a support for the Work movable toward and fron'i said one. or more knives, means to revolve the work, and a link mounting for said work support constructed to cause the work to travel in a plane throughout the range of action of the knife or knives thereon, substantially as described.

In a turning appliance of the character described, the combination of a frame, one or more knives thereon, a support for the work movable toward and from said one or more knives, and a link mounting for said work support including an inner link and one or more longer outer links, substantially as described.

4-. In a turning appliance of the character described, the combination of a frame, one or more knives thereon, a support for the work movable toward and from said one or more knives, and inner and outer links pivotally supported at their upper ends on said frame and pivotally connected at their lower ends to said work support, the movement of the work being in a plane throughout the range of cutting action thereon, substantially as described.

In a turning appliance of the character described, the combination of a frame, a revoluble shaft thereon, one or more knives on said shaft, a support for the work movable toward and from said shaft, means to revolve the work, a link mounting for said support comprising a single braced inner link pivoted to the frame at its upper end and pivoted at its lower end to said work support, and a plurality of longer outer links pivoted at their upper ends to said frame and at their lower ends to said support, said mounting causing the work to travel in a plane toward and from said shaft through out the range of cutting action thereon, an operating handle, and a connection between said handle and said Work sup port, substantially as described.

GUSTAVE T. JOHNSON. 

